Question

4. How was time measured when pendulum clocks were not invented? How would the time period of a simple pendulum be affected if:
(a) Displacement of the bob from the mean position is increased or decreased?
(b) The length of the string is increased or decreased?
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Answer 1

Answer:

when pendulum was not invented shadow clock was used to measure the time

Explanation:

by using the shadow the time was measured in the pendulum was not invented